feat: Support tableformer model choice (#90)

* Support tableformer model choice

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Update datamodel structure

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Update docs

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Cleanup

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Add test unit for table options

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Ensure import backwards-compatibility for PipelineOptions

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Update README

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

* Adjust parameters on custom_convert

Signed-off-by: Christoph Auer <60343111+cau-git@users.noreply.github.com>

* Update Dockerfile

Signed-off-by: Christoph Auer <60343111+cau-git@users.noreply.github.com>

---------

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>
Signed-off-by: Christoph Auer <60343111+cau-git@users.noreply.github.com>

docling/models/table_structure_model.py

@@ -1,4 +1,5 @@
 import copy
+from pathlib import Path
 from typing import Iterable, List
 
 import numpy
@@ -12,16 +13,22 @@ from docling.datamodel.base_models import (
     TableElement,
     TableStructurePrediction,
 )
+from docling.datamodel.pipeline_options import TableFormerMode
 
 
 class TableStructureModel:
     def __init__(self, config):
         self.config = config
         self.do_cell_matching = config["do_cell_matching"]
+        self.mode = config["mode"]
 
         self.enabled = config["enabled"]
         if self.enabled:
-            artifacts_path = config["artifacts_path"]
+            artifacts_path: Path = config["artifacts_path"]
+
+            if self.mode == TableFormerMode.ACCURATE:
+                artifacts_path = artifacts_path / "fat"
+
             # Third Party
             import docling_ibm_models.tableformer.common as c